And ancient rock carvings created by native Americans have been hacked away by thieves using power saws.

美国土著人创造的岩画面被小偷用电锯割下偷走。

Over many years, the Colorado River has carried away particles of dirt and rock, carving its path deeper and deeper into the ground.

经过许多年，科罗拉多河带走大量土和岩石的颗粒，使得河床一步步深入地底。